Hollow form



Sept. 11, 1945. R. w. HEM'PHILL HOLLOW FORM Filed Novi. 16, 1944 QAYDUQN W HEMPHILL Patented Sept. 11, 1945 v p 2,38 4,74l

HoLLoW FORM Rayburn W. H emphill, Akron, zhio, assi gnor to The Colonia! Insulatoi' Company, Akron, Ohio,

a corporation of Ohio m w 16, 1944; Serial No. 563,777

r Application November V4 olaims. (01.18-4-4'1);

The present invention relates 'to the manufacture of hollow forms such as'employed in the making of rubber gloves or other goods of a like nature. These articles are generally known as dipped'goods' The forms are commonly inade of porcelain or other` ceramic material and are coated with a glaze, the forms being usually dipped in solutions or dispersions of rubber which deposit thereon thin films which are subsequently dried and 'vulcanized For facilitating the handling of these forms during the dipping, drying and vulcanizing Operations, they are usually secured to metal straps or clips which are attached through the base of the form. Ordinarily, the base of the form is a slab of Ceramic material similar to that composing the body of the form and the bolts or other securing means by which the form is attached to the Strap or clip are passed through this base.v Alternatively, the base of the form may be a plug which is inserted in the lower end of the form body. I

, The forms are apt to be handled roughly during the manufacturing Operations and the danger of cracking the bases of the forms about the points where the fastening means enter is quite a serious one and results in much loss of costly dipping equipment. Also in forms provided with a plug type base such as shown in the expired patent to Criner No. 1,410169 of March 21, 1922,.

the .danger of breaking the cement which holds the plug in place is a serious objection.

The present invention has for its object the design of a ceramic' form of the general type set forth in which the slab of Ceramic material which I.

constitutes the base of the form is provided with a heavily reinforced internally located projection or enlargement which is specially formed -so as to provide a secure anchorage for the bolts or other attaching devices by which the form is attached to the clip or support.

In the drawing and description is disclosed one example of the invention as it has been perfected, but it will be understood that the details are not essential and these may be varied or improved within the scope of the invention as set forth in the appended claims.

In the drawing in which the best known and preferred form of the invention is illustrated:

Fig. 1 is a side view of the form partially completed, the lower portion of the form being in section;

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1, showing a completed form with a metal strap attached thereto;

rubber article. samestock and is usuallyformed in the lraw state Fig is a section'on the line 3-3 of Fig. '2; and Fig; '4 is-a section on' the line 4-4 of Fig; 2.' The methodV followed in themanufacture of the 'form is similar to that shown in the prior patent to James R. Hem-phill, No. 2,261,-583 dated November 4, 194z.v 'The main body of the hollow ceramic form is indicated at IO and is usually made of a high gracie porcelain stock. The upper'part of theform, which is omitted 'from the drawing, is of the shape desired for the completed The base |2 of the form is of the 'fi l1et, indicated at H, is provided around the inside Alower edge of thebody and an intervening layer of slipV |5 is applied to thelower edge of the 1body so as to adhere the base in place. When the form is trimmed and bakedit is almost impossible to discern any'line of division between the base and the lower edge of the body. V'I'his procedure makesa very strong union between base and body 'and there is no tendency whatever to fractureat the line of junction between these two portions of the form. This method of joining the base to the hollow body is particularly desirable in forms which are attached to metal clips or straps.

The dificulty with forms as shown in the prior 'Hemphill patentlreferred to above is that a base slab' of the uniform thickness shown therein will 'easily fractureat the points of attachment when va form is roughly handled by the attached clip.

It has been customary to use metal plates on either side of the base through which the clamping bolts pass and the breakage with this type of fastening has been quite an important item of expense in the manufacturing Operations.

In order to improve upon and strengthen the li'orm at this point, the base of the form is provided with a substantially thickened portion or projection |6 which in the particular form shown is elliptical in shape and projects into the interior of the body for a substantial distance. The upper portion of this enlargement is cut away to provide a rectangular recess ll which usually extends about one-third of the depth of the enlargement. Coextensive longitudinally with the recess I'l is the slot |8 which extends through the base. At the central portion of the slot its walls are cut away on either side to the width of the recess as at 20, giving the slot |8 a somewhat cross-shaped configuration, but leaving pairs of the nuts started on the ends of the bolts.

In assembling the clip on the form the bolts 24 are first inserted in the plate 26 and'v Suflicient looseness of the bolts permits thenuts to be passed successively through the wide central portion of the slot and then moved to positions over their final seats. The screws are then rotially coextensive with the recess and communicating at its upper end with the recess, said slot being adapted to receive the stem of the bolt, said slot being enlarged at one point to provide passage for the clamping means.

2. A form for use in the manufacture of dipped goods comprising a hollow ceramic lbody, a ceramic slab extending across the open end of the body, a clip and securing bolts for the clip, an integral enlargement on the inner face of the slab and projecting into the body, the upper portion of the enlargement being provided with a recess, the walls of which are adapted to contact clalmping means associated With the securing bolts, said enlargement being provided with a relatively narrow elongated slot substantially cotated, drawing the nuts to their seats and tightening the clip. This method of attaching the clip may be varied, if desired. The nuts 21 constitute the clamping means in association'with the screw-threaded bolts, but Van obvious Variation would be to substitute ordinary headed bolts for those shown and to reverse the position of the bolts, in which case the heads off the .bolts 'Would ,be the clamping means which rest upon the Such forces as may be exerted due to rough handling of the form are transmitted by the bolts to the massive enlargements which are capable of resisting them and the tendency to breakage or chipping of the base is greatly reduced. When the device is assembled the clips .25, 26 and the form are rigidly held together .and a much snperior unit is thereby obtained.

It will be understood and appreciated that the nvention may 'be capable of em=bodiment in other specific forms than that shown and that it is not the intention to limit the scope thereof by the details set forth. It will be seen, holwever, that by the use of the improved method of moun-ting vand attaching the clip and the form, a more rigid and Stronger connection has been provided.-

What s claimed is: 1. A form for use in the manufacture of dipped goods comprising a hollow ceramic body, a ceramic slab having a baked union with Vthe lower edge of the body, a clip and asecuring bolt for the clip, an enlargement on the inner face of the slab and extending into the-body, the upper portion of the enlargement .being provided With a recess, the 'wall of which is adapted to contact a clamping means carriedl bthe securing bolt, said enlargement being provided withpa relatively narrow elongated slot'substanextensve With the recess and communicating .with the recess, said slot lbeing adapted to receive the stems of the bolts and providing ledges on either side thereof to act as abutments for the clamping means, said slot having a centrally located portion of suflicient width to permit the insertion of the clamping means.

3. A form for use in the manufacture of dipped goods comprising a hollow Ceramic body, a ceramic slab extending across the open end of the body and permanently united to the edge of the body by a baked union, an integral enlargement on the inner face of the slab and projecting into the body, bolts passing through the base and extending into the projection, the upper portion of the projection being provided With a recess the Walls of which contact nuts on the bolts, said base having a through passage for the nuts, and reduced slots communicating there'with tc receive the stems of the bolts, ledges at the base of the recess to form abutments for the nuts, and a form-support held ,against the under side of the base'by the bolts.

4. A form for use in the manufacture of dipped goods comprising a hollow-Ceramic body, a ceramic sla'b extending across the open end .of the body and permanently united to the edge of the body bya baked union, an integral enlargement on the inner face of theslab and projecting into the body, a form support resting against the underside of the base, a bolt and nut for securing the support to the'base, the stem o'f said bolt passing through the body and thesupport, and means on the projection to hold one of the elements of the nut and bolt against rotation and to form an abutment for tightening the bolt, the base vbeing provided with an enlarged passage for permitting the insertion of the bolt-into the form. RAYBURN W. HEMPI-IILL. 

